Lock construction



LOCK CONSTRUCTION Filed Feb. 14, 1954,

Sheets-Sheet 1 INVENTOR o vw. .0 /A Am Oct. 27, 1936. A. scHooREL 2,058,517

" LOCK CONSTRUCTION FiledFeb. 14, 1934 n 2 sheets-sheet 2 INVENTOR lll Patented Oct. 27,` 1936 LOCK CONSTRUCTION Adam Schoorel, New York, N. Y., `assignor to Francis Keil & Son, Inc., a corporation of New York Application February 14, 1934, Serial No. 711,091

11 Claims.

This invention relates to lock construction.

`One of the objects of this invention is to provide a simple, inexpensive and thoroughly practical lock construction and particularly one of wide adaptability of use. Another object is to provide a bolt-operating mechanism that will be simple, compact, inexpensive of manufacture, reliable in action, and easy to assemble. Another object is to provide a construction of the abovementioned character in which a so-called latch bolt is provided but which may be made, as desired, to function as a dead bolt. Another object is to provide a construction of the abovementioned character which is readily reversible. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings in which is shown a preferred embodiment of my invention,

Figure 1 is a vertical sectional view through a door, or the like, and the bolt and key-controlled mechanism related thereto;

Figure 2 is a rear plan view showing the lock casing with its rear cover removed and showing the parts in position for operation as a latch bolt;

Figure 3 is a vertical central sectional view, as seen along the line 3--3'of Figure 2;

Figure 4 is a view like that of Figure 2 but showing the parts in the position in which the bolt functions as a dead bolt;

Figure 5 is a plan view of the rear cover plate of the bolt mechanism;

Figure 6 is a perspective viewof the bolt per se;

Figure 7 is a perspective view of a locking member, and

Figures 8 and 9 are perspective views of certain parts coacting with the bolt and other parts in `achieving assembly.

Similar reference characters refer to similar parts throughout the various views of the drawings.

Referring iirst to Figures 1 and 2, there is shown a lock casing I generally rectangular in shape and provided with holes II (Figure 2) for the reception of screws, whereby the casing I 0 may be secured to a door or like member I2 (Figure l), the door I2 being provided with a hole I3 in which is received the cylinder and barrel or other suitable type of key-controlled mechanism I4, being held assembled to the door I2 by any `suitable means, such as the front escutcheon plate I and a rear plate I6 and screws lll-I8 passing through the plate I6 and threaded into the cylinder I4, for clamping the door between the parts I5 and I6. The cylinder (Cl. l0- 29) I4 is provided with an operating bar I9 that is` rotated under the control of a suitable key and that extends through a hole ZIJ in the back securing plate I6 to be received into the slot 2| (Figures l and 5) of a bushing 22 rotatably carried bythe back cover plate 23 of the casing IU. The `cover plate is secured in closed position to the casing I 0 in a 4manner hereinafter described and on the inner face thereof and suitably secured to or driven by the bushing 22 is an operating member or crank 24 for coaction with mechanism :as hereinafter described.

'Thedront face Illa ofthe casing I6 (see Figure 1^) has rotatably mounted in it a sleeve 25 whose inner endhas secured to it a crank arm 26 carrying a crank pin 2l and whose outer end has secured yto it 'a A:knob 28. Knob 28 is adapted to be manually yoperated from the inside of the door in order to control the bolt mechanism, through the crank Apin 2J, as described more clearly hereinafter.

The left-hand vend wall II)b (Figures 2 and 3) of the casing II) is provided with a rectangularshaped hole Il)c through which extends the head 2921er a bolt generally indicated at 29 (see also Figure l6'), the walls of the hole Il'Ic forming a four-sided bearing .for slidably supporting the left-hand end of the bolt 29. The head 29a of the bolt will be `seen to have a beveled end face 29b for coaction with a keeper vindicated in Figure 3 at 3U, the keeper 3U being provided with an opening 30a to receive the bolt head 29a, as hereinafter described.

Bolt `29 is bifurcated (Figure 6) having two parallel land spaced extensions 3| and 32 between which, as the bolt structure is inserted into the casing I0., with the head i!!!a inserted into the casing `hole IDG, `an upstanding post 31 (Figure 3) is received, post 31 being conveniently integrally formed with the front casing wall IIJ-a and acting, with the parallel faces 3Ia and 32a (Figure 6) to 'guide the bolt as it slides and maintain it in proper alinement relative to the four bearing faces of the hole :Illc in the end wall I'Ilb (Figure 3).

The head 29a (Figures 3 and 6) of the bolt is bored -out `as at 33 to receive the `cup-shaped member 34, shown in perspective in Figure 8 and in section in Figure 3, member 34 being conveniently drawn or stamped out of sheet metal, being snugly tted into the round hole 33 of the bolt head 29a, vand having preferably integrally formed therewith a plate-like flange 35 adapted to be received between the parts 3I and 32 of the bolt (see Figure 2) and `having a flange 36 extending parallel to the axis of the cup 34 (Figures 8 and 3) and ladapted to overlap the bolt and contact with the inner face of the end Wall I0b of the lock casing, as is better shown in Figure 3.

into this cup member 3d is inserted one end of a helical spring 43 (Figure 3), the spring extending alongside of and in between the spaced extensions 3I-32 of the bolt and extending toward the post 31, being abutted thereagainst in a manner hereinafter described and tending always to force the bolt 29 towards the left and out of the casing lll.

As appears clearly in Figure 6, the bolt 29 is preferably symmetrically constructed. Thus, the extensions 3 [-32, which are somewhat plate-like, are provided respectively with bearing recesses or slots 3l*J and 32h, into either of which the crank pin 21 (Figures 1 and 2) may be fitted as the parts thus far described are assembled, depending upon whether the bolt construction is inserted to act as shown in Figure 3 or reversed, that is, inserted up-side down and hence with the cam face 29b facing downwardly instead of upwardly as it is now in Figure 3. Likewise, the parts 3 I-32 are provided respectively with abutments or studs 36C and 32c and with cylindrical pivoting studs 3ld and 32d (see Figure 6). Studs 35 and 3ld, however, face upwardly (Figure 6) from part 3l, while studs 32c and 32d face downwardly from part 32. Upon either of studs 3|d or 32d depending upon which is brought to face upwardly and whether the lock is applied to an inwardly or outwardly swinging door, and illustratively upon the pivot stud 3|d, there is placed a vplate-like locking member 38 shown in perspective in Figure '1.

Locking member or detent 38 may conveniently be a sheet metal stamping and it has a hole 38ab in which the pivoting stud 3 ld (or stud 32d, if the bolt 29 is reversed or turned up-side down) is received; also it has an arcuate hole 38b into which the crank pin 21 (see Figure 2) is received. Intermediate of the holes 38a and 38b the plate 33 has a slot 38c in which is clamped a leaf spring 39 (see Figure 7) adapted to abut against abutment Sic (see Figure 2), or against the abutment 32c (Figures 2 or 6) if the member 38 is mounted upon the other extension 32. The leftliand end of member 38 (Figures '7 and 2) is hook-shaped as at 38e adapted to coact with and take in back of a lug 4l) (Figures 2 and 4) if it is mounted upon the extension 3l or if mounted upon the extension 32; lug 49 is integrally formed upon the interior of the casing I0 (see Figures 2 and 4) and conveniently it may be formed as part of the wall of the screw hole Il.

Having thus selected which way the cam face 29b of bolt 29 is to face and having laid the detent 38 upon one of the extensions, such as the extension 3l, as above described, I now apply to the mechanism a sheet metal part, shown 1n perspective in Figure 9 and indicated generally by the reference character 42. Member 42 (Figure 9) is in part U-shaped, having two parallel side portions 42a and 42b joined by a front wall portion 42, the latter portion having secured thereto or preferably integrally stamped therein a cylindrical stud-like part 42d. Intermediate the ends ofthe portion 42a and 42b the latter are provided respectively with oppositely directed tongues 42e and 42f, while at their right-hand ends; as viewed in Figure 9, they are provided with flanges 42g and 42h.

The part 42 is shaped as above'described but in relation to certain configurations given the extensions 3i-32 of the bolt 29 (see Figure 6); the bearing surfaces 3 Wand 32a are stepped away lfrom each other as at 3 le and 32e by substantially the thickness of the portions 42a and 42b (Figure9) of the part 42, whereupon the extensions 3i and 32 are cut-out or notched, as at 3If and 32f, the notches being dimensioned so that the laterally projecting flanges 42g and 42h (Figure 9) may be passed therethrough and so that, upon subsequent movement of the part 42 in a direction toward the right, as viewed in Figure 6, the flanges 42g and 42h take down in under the extensions 3l and 32, respectively, parts 42a and 42b being respectively accommodated in the set-backs 3l@ and 32e (Figure 6) of the bolt extensions 3| and 32.

But the above-described assembly of the part 42 to the bolt 29 brings the horizontally extending arm 42e into a position overlapping the detent or locking member 38 (shown in detail in Figure '7), this overlapping relation being better shown in Figures 2 and 4. Of course, if the bolt is turned over to reverse its latch action and the detent 38 is mounted on the other extension 32, the tongue 42e (Figure 9 or 2) is brought into overlapping relation thereto, just the same. Thus, the tongue 42e functions to hold the detent 38 against moving off of its pivoting stud (stud Sid or 32d), depending upon which extension or stud the detent 38 is mounted upon. Tongue 42f rests upon the upper face of part 32 and with flange 42h aids to hold part 42 assembled to the bolt structure.

At the same time the flanges 42g and 42h (Figure 9) take in Linder the extensions 3| and 32, respectively, and thus take part in holding the part 42 and the detent 38 in assembled relation to the bolt structure 29. Also, referring now to Figures 3 and 2, the post 31 is shaped or cut-out or stepped as at 31a to snugly receive or be encompassed by the U-shaped portions 42a, 42c and 421D of the member 42, so that the member 42 snugly hugs the post 31 on three sides, being additionally secured in place as is described more clearly hereinafter.

The stud-like extension 42d, better shown in Figure 9, receives the right-hand end (see now Figures 2, 3 or 4) of the helical spring 43, the latter being thus securely held in assembled relation, its left-hand end extending materially into the hollow bolt 29 and into the socket member or cup-shaped part 34, as above described.

The cover plate 23 (Figure 5) is now ready to be put in position. Cover plate 23 (Figures 1 and 5) is of suitably heavy sheet metal, being stamped to have a depressed portion 23e, a portion of which is slotted as at 44 (Figure 5). Plate cover 23 is also cut out, as at 45C, to give adequate space for the passage of the screws that go through the holes Il (Figures 2 and 4) that secure the casing l to the door I2.

In placing the cover 23 in closed position, it is properly alined with respect to the parts within the casing I9, as well as with respect to the casing I9 itself, by means of suitably distributed shoulders 45 (Figure 2) suitably formed in preferably the four side walls of the casing i0 and preferably lying in the same plane. When the cover plate 23 is thus positioned by these shoulders 45, the central part of the depressed portion 23a surrounding the slot or hole 44 (Figure 5) comes to rest against the innermost end of the post 31 (see Figure 3) whereupon a screw 46l is passed through the hole 44 (Figure 5) in the cover plate 23 and threaded into the post 31, thus to secure the cover plate 23 in assembled relation to the casing.

The cover plate 23, being thus now fixed in place, also acts (see Figure 3) to conne the portion 42c of the member 42 (Figure 9) against upward movement, as viewed in Figure 3, away from the stepped portion 311ab of the post 31` Thus, the plane of the iianges 42g and 42h (Figure 9) of the member 42 is xed in position relative to the guiding walls of the hole It)c (Figure 3) in the end wall `10b of the casing IB, and thus these flanges 42g and 42h also coact in determining the :guiding of the bolt '29 during its movement` Also, assembly of the cover 23 brings the operating cam or crank 24 (Figures 5 and l) into operative assembly or relation to the crank pin 21, so that the latter may be actuated independently of the knob .28, by `the key-controlled mechanism I4 (Figure 1) which operates through the connecting `or operating bar i9.

Considering now certain features of the operation of the mechanism and referring rst to Figure 2, it is to be noted that spring 43 tends always to push the bo-lt 29 to the left and out of the casing i9, the parts normally assuming the relation shown in Figure 2 and also in Figure 3. If, therefore, the door is swung shut, the cam or beveled face 29b of the bolt head, when it contacts with the keeper 3), simply cams the bolt structure 29 toward `the right and into the casing il), compressing the spring 43, `moving crank pin 21 in clockwise direction, whereupon, when the bolt has adequately by-passed part of the keeper 3i), the spring 43 snaps the bolt out of the casing again and into the position shown in Figure 2 or 3. Movement of the bolt 29, under the action ofthe spring 43, beyond the position of the parts shown in Figures 2 and 3, in a direction toward the left, is prevented by the engagement of the flange 35 of the spring socket 34 with the end wall Hlb of the casing, acting as a stop.

Thereafter, the bolt may be manually withdrawn by rotating the crank pin 21 in clockwise direction by means of the knob 28 (Figure l) or by means of the key-controlled mechanism I4, the latter rotating the cam or crank 24 (see also Figure 5) through the connecting or operating bar I9 (Figure 1), spring 43 in either case reg turning the bolt to normal position, as shown in Figures 2 and 3.

A transversely slidable knob 41 (see Figure 3) in the front wall l!)a of casing I0, operating in and guided by a transversely extending slot in the wall Ille, controls the position of a member 48 relative to either of the abutments '31 or 32, depending upon the position of the bolt; that is, if the bolt is employed in the position as shown in the drawings, abutment 3I engages. spring 39 (see Figure 2) and abutment 32c is blocked against retrograde movement by the member 48 when the latter is actuated by the knob 41. If the bolt is reversed after the manner described herein abutment 32c engages spring 39 and abutment 3|c becomes related to be blocked by member 48 when positioned by the knob 41. Knob 41 is, of course, positioned at the inner side of the door v and operable only from that side.

The bolt 29, however, because of the elongated shape of the head 29aL (Figures 3 and 6) thereof and the relations of the parts above described, has a movement outwardly of the casi-ng beyond that shown in Figures 2 or 3, in order, among other things, to bring the beveled or cam face 29b (Figure 3) way into the keeper 3B and out of the range of the crack or space between the adjacent keeper and lock casing walls, in order thus to prevent the insertion of an implement fromthe outside of the door to force the bolt inwardly of the casing, against the action of the spring 43.

When it is so desired to extend the movement of the bolt 29--3-32 into what I term a dead bolt relation to the keeper 30, the crank pin 21 is given a movement in counter-clockwise direction, as viewed in Figure -2, either by rotating the knob 28 or by rotating the cam or crank arm 24 through the key-controlled mechanism, to the position of the crank pin 21, as shown in Figure 4, as a result of which certain unique actions are made to take place.

Firstly, and referring to Figure 2, note the angularity between the slot 38h in the detent 38 and the slot SIb in the bolt extension 3i, bearing in mind, of course, that a similar angularity exists with respect to the slot 32b (Figure 6 or 2) in the other bolt extension 32, were the detent 38 to be mounted upon the latter with the bolt reversed (turned upside down) and stud 32dbrought to face upwardly.

Continued counter-clockwise movement of the crank pin 21 (Figure 2) is made to react against the straight or transverse portion of the slot 31h, thus forcing the bolt 29 to the left, the action of the vspring 43 on the bolt 29 being now precluded because of the stop action between the ilange 36 of the spring socket 34 and the end wall lb of the casing, bolt 29 being projected into the position shown in Figure 4 wherein the crank pin 21 snaps into the rounded inner and left-hand part (see Figure 6) in the slot 3Ib in the bolt extension 3|.

But this counter-clockwise movement of crank pin 21 is accompanied (see Figure 2) by a movement of the crank pin 21 downwardly toward the left, the crank pin 21, during the earlier portion of this movement passing freely along the slot 38b in the detent 38 until it bottoms in the left-hand lower portion of that slot; in the interim the hook-shaped part 38e has been gliding along or past the lug or shoulder 40 in the casing ID (Figure 2) and by the time the crank pin 21 snaps into the bottom of the bolt slot 3l", as above described, hook part 38e has just about by-passed the shoulder 4B and is ready to take in back of or rather to the left of the shoulder 4D, which it actually ydoes do as the crank pin 21, already bottomed in the detent slot 38h, snaps into the bottom or base portion of the bolt slot 3th.. The spring 39 of the detent 38, reacting against the abutment vor stud 31 and tending to swing the detent 38 in clockwise direction about the pivoting stud 31d, thereupon acts to hold the hookeshaped part 38e in engagement with the shoulder 40, whereupon the detent 38 positively precludes movement of the bolt 29 in a direction inwardly of the casing I0. The bolt is thus positively locked in dead-bolt position.

To remove it from dead bolt position, crank pin 21 is moved either by the key-controlled mechanism cr by the handle 28 (see Figure l) in clockwise direction, as viewed in Figure 4, whereupon the crank pin 21 first swings the locking member 38 in counter-clockwise direction about the pivoting stud 3|d thereof, thus to disengage the hook part 38e thereof from the shoulder 40 continued subsequent clockwise movement of the crank pin 21 acting to withdraw the `bolt 29 into the casing l0 to an extent commensurate with the movement of the crank pin 21.

The above-described dead bolt action can, o1 course, be achieved equally as above described,`

if the detent member 38 were mounted on the other bolt extension 32 with the bolt 29-34-32 turned upside down from the position of Figure 3, in which case it coacts again with the shoulder (Figure 2) in the inside of the casing I0, crank pin 2l, swinging through the same arc or arcs but now acting in the slot 32lo of the bolt extension 32, as well as in the detent slot 38".

If it is desired thus to reverse the latch action of the mechanism, as for adapting the mechanism to a door that swings downwardly as viewed in Figure 3 instead of upwardly, all that is needed is to remove the back plate 23 by removing the screw 46 (Figure 3), whereupon the spring 43 is first easily removed, member 42 (see Figure 9) disengaged from the bolt extensions 3l--32 by sliding it toward the left, relative thereto, to bring the parts 42g, 42h thereof in alinement with the recesses 3If and 32f, respectively (Figure 6') thus to permit the part 42 to be lifted out of engagement with the bolt extensions and thus removing the tongue 42e thereof from its overlapping relation to the detent 38. The bolt is then lifted out, turned upside down, member 34 is removed from hole 33 and correspondingly reversed so that flange 36 remains in the position shown in Figure 3 and reinserted into the hole 33. The bolt is then re-inserted into the casing I0, this time with the cam face 29b (Figure 3) facing downwardly instead of upwardly, crank pin 2l is then engaged into the slot 32b of the bolt extension 32 as the bolt is thus replaced into the casing, detent or locking member 38 now assembled relative to the parts 32c and 32d (Figure 6) which now face upwardly, and member 42 replaced in the manner above described, tongue 42e now again overlapping the detent 38 and holding it in place on the extension 32. The spring 43 is replaced, as is also the cover 23, and the mechanism is now ready for actuation on a door that swings the other way.

Thus, it will be seen that there has been provided in this invention a lock mechanism in which the various objects hereinbefore set forth, together with many thoroughly practical advantages, are successfully achieved. It will be seen that the construction is simple, inexpensive and is reliable in action, and, moreover, that the parts may be inexpensively constructed. The bolt (Figure 6) may be a casting such as a die casting, and other parts, such as those shown in Figures 7, 8 and 9, may be easily stamped out of sheet metal. Moreover, exceeding compactness is achieved without sacrifice of reliable and adequate spring action, the housing of part of the spring 43 within the hollow bolt materially g contributing toward such advantages as these. Moreover, the construction will be seen to be well adapted to meet the varying conditions of hard practical use.

As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth, or shown in the accompanying drawings, is to be interpreted as illustrative and not in a limiting sense.

I claim:-

1. In lock construction, in combination, a casing having a substantially centrally positioned post and a bolt-guiding opening in an end wall thereof, a bolt guided in said opening, said bolt having two spaced parts, one on each side of said post, and having a hole directed toward the space between said spaced parts, a spring socket received within said hole, a spring having one end within said socket and the other end abutting against said post, means related to said socket and coacting with said casing for limiting the movement of the socket beyond the position in which said bolt projects to function as a latch bolt, and means for locking said bolt in a position beyond its latching position and into a dead bolt position.

2. In lock construction, in combination, a casing having a substantially centrally positioned post and a bolt-guiding opening in an end wall thereof, a bolt guided in said opening, said bolt having two spaced parts, one on each side of said post, and having a hole directed toward the space between said spaced parts, a spring socket received within said hole, a spring having one end within said socket and the other end abutting against said post, a member interposed between said two spaced parts of said bolt and having parts detachably interengaged therewith for holding said other end of said spring in abutting relation against said post, means related to said socket and coacting with said casing for limiting the movement of the socket beyond the position in which said bolt projects to function as a latch bolt, manually operable means related to said casing for moving said bolt, a detent carried by said bolt and related to said means for operation thereby, said member having a part overlapping said detent to hold the latter against movement out of operative relation to said bolt, and means whereby said detent locks said bolt against retrograde movement after said rstmentioned means has moved the bolt beyond its latching position.

3. In lock construction, in combination, a casing having a substantially centrally positioned post and a bolt-guiding opening in an end wall thereof, a bolt guided in said opening, said bolt having two spaced parts, one on each side of said post, and having a hole directed toward the space between said spaced parts, a spring socket received within said hole, a spring having one end within said socket and the other end abutting against said post, means related to said socket and coacting with said casing for limiting the movement of the socket beyond the position in which said bolt projects to function as a latch bolt, a crank pin, one of the parts of said bolt having a slot for receiving said crank pin, a detent member movably mounted upon said one part of said bolt and coacting with said crank pin, and means whereby said detent locks said bolt against retrograde movement after said crank pin has moved the bolt beyond its latching position and into a dead bolt position.

4. In lock construction, in combination, a casing having movably supported therein a bolt adapted to be projected out of or withdrawn into said casing, said bolt being operable to attain an unlocked, latching, or dead bolt position, a detent pivotally mounted on said bolt and thereby movable with and relative to said bolt, said detent having a substantially elongated opening, a crank member operable to place said bolt in any of said positions and having a pin engaging in said elongated opening and capable of movement along said opening, thereby forming a lostmotion connection between said crank and said detent, and a shoulder in said casing positioned to coact with a portion of said detent, said detent being adapted to abut against a face of said shoulder when said bolt is in unlocked or latching position and in which position said crank pin is at one end of said elongated opening but said detent, when said bolt is moved by actuation of said crank member to dead bolt position and during which movement said crank pin moves to the other end of said elongated opening, being moved by said crank pin into interlocking position with said shoulder.

5. In lock construction, in combination, a casing having an opening in a wall thereof, a bolt member adapted to project through said opening, said bolt member having an opening therethrough and being operable to attain an unlocked, latching, or dead bolt position, a crank member having a crank pin thereon operable to place said bolt member in any of said positions, a detent carried by and movably mounted on said bolt and having a hook-shaped portion at an end thereof and an opening therein substantially near the other end thereof, said detent adapted to maintain said bolt member in dead bolt position, a shoulder in said casing for coaction with said hook-shaped portion of said detent, said hookshaped portion adapted to abut against said shoulder, said crank pin engaging said openings in said bolt member and said detent whereby motion of said crank causes said pin to coact with said openings to actuate said bolt and said detent in such manner that, when said bolt is in latching position, said hook-shaped portion is only in abutting relation to said shoulder but, when said bolt passes to dead bolt position, said hook-shaped portion of said detent interlocks with said shoulder.

6. In lock construction, in combination, a oasing having an opening in a Wall thereof, a bolt member adapted to project through said opening, said bolt being operable to attain an unlocked, latching, or dead bolt position, a crank member operable to place said bolt in any of said positions, a pin on said crank member, a pivotally mounted detent adapted to maintain said bolt member in locked or dead bolt position, said detent having an opening therein, and a shoulder in said casing positioned to coact with a portion of said detent, said detent being adapted to abut against a face of said shoulder when said bolt is in latching position and said pin being operatively associated with said opening whereby, upon operation of said crank member, said detent is actuated and released from abutment with said face of said shoulder and is moved to interlock with said shoulder to maintain said bolt in dead boit position.

7. In lock construction, in combination, a casing having an opening in a wall thereof, a bolt member adapted to project through said opening, said bolt member having an opening therein, said bolt member being operable to attain an unlocked, latching, or dead bolt position, a crank member operable to place said bolt in any of said positions, a pin on said crank member, a shoulder in said casing and a detent carried by and movably mounted upon said bolt for coaction with said shoulder to maintain said bolt member in dead bolt position, said detent having an opening therein, said crank pin extending into said openings in said bolt and said detent and being thereby operatively associated therewith whereby motion of said crank member is translated into movement of said bolt and said detent to respectively direct and place said bolt member in position for latching or dead bolt action.

8. In lock construction, in combination, a oasing having an opening in a wall thereof, a bolt member adapted to project through said opening, said bolt being operable to attain an unlocked, latching, or dead bolt position, a crank member operable to place said bolt member in any one of said positions, a pin on said crank member, a detent adapted to maintain said bolt member in dead bolt position, said detent having an opening therein, said pin on said crank member being operatively associated with said opening in said detent whereby, upon operation of said crank member, said pin and the walls of said opening coact to actuate said detent.

9. In lock construction, in combination, a casing having an opening in a Wall thereof, a bolt member adapted to project through said opening, said bolt being operable to attain an unlocked, latching, or dead bolt position, a crank member operable t0 place said bolt member in any of said positions, said crank member having a crank pin, and a movable detentV adapted to maintain said bolt member in dead bolt position, and means on said bolt member and said detent for engaging with said crank pin, one of said means comprising a lost motion connection, whereby said crank member is operatively associated with said detent and bolt member whereby upon operation of said crank member said means actuates said bolt member and said detent.

l0. In lock construction, in combination, a casing having an opening in a wall thereof, a bolt member adapted to project through said opening, said bolt being operable to attain an unlocked, latching, or dead bolt position, a detent pivotally mounted on said bolt member, said detent having a hook-shaped portion at an end thereof, a crank member operable to place said bolt in any of said positions, a shoulder in said casing positioned to coact with a portion of said detent, and means forming `operating connections between said crank member and said bolt and detent, said means including a lost-motion connection between the crank member and said detent for actuating the bolt and detent, said lostmotion connection permitting said detent to slide along said shoulder when said bolt is passed, by operation of said crank member, from latching to dead bolt position but effecting interengagement of the detent with said shoulder after the lost-motion in the connection is spent.

11. In lock construction, in combination, a casing having an opening in a Wall thereof, a bolt member adapted to project through said opening, said bolt being operable to attain an unlocked, latching, or dead bolt position, a detent pivotally mounted on said bolt member, said detent having a hook-shaped portion at an end thereof, a crank member operable to place said bolt in any of said positions, a shoulder in said casing positioned to coact with a portion of said detent, and means forming operating connections between said crank member and said bolt and detent, said means including a pin on said crank member and a slot in said detent comprising a lost-motion connection between the crank member and said detent for actuating the bolt and detent, said lost-motion connection permitting said detent to slide along said shoulder when said bolt is passed, by operation of said crank member, from latching to dead bolt position but effecting interengagement of the detent with said shoulder after the lost-motion in the connection is spent. 

